m4: defconfig update

SELinux was enabled, but not really, due to CONFIG_SECURITY being set to 'n'.
Manual defconfig editing?

CONFIG_MMC_MSM_SDC3_NEED_PAD_PWR got renamed to CONFIG_MMC_MSM_SDC3_PAD_PWR_SWITCH,
fix that.

Change-Id: Ida7fd89795c6f4e15a6e7f41d6e4ab3624810c6e